Abstract: An unwinding unit (400) for unwinding a strip (S) of heat sealing material for quadrangular machines (1) comprises a casing (401) adapted to be mounted on a quadrangular machine (1) and a puller (402) operatively associated with the casing (401) and configured to pull the strip (S) relative to the casing (401) along a feed path (P) and in a feed direction (V). A diverter (407) is configured to divert the strip (S) between an initial, preferably horizontal, stretch (P1) of the feed path and a final, substantially vertical stretch (P2) of the feed path, defining a curved, connecting stretch (P3) between the initial stretch and the final stretch. A deformer (413) operatively associated with the casing (401) are configured to make on the strip (5) an extended crease line (414) running along the strip itself starting from the curved stretch (P3) or downstream of the curved stretch (P3), in the feed direction (V) of the strip (S).

Abstract: A quadrangular machine for forming boxes (1) from blanks (2) having a base and a plurality of segments connected thereto, comprises a die (3) operating on said base; folding elements (4) for folding and setting up said segments to define edges (5) of the box (1); feeders (6) for positioning pieces (7) of heat seal stay tapes to face the edges (5); sealing heads (8) with heatable pressers (9) movable towards and away from the box (1) perpendicularly thereto to press said pieces (7) against the respective edges (5), and with blades (10) which are movable as one with the corresponding presser (9) to cut the stay tapes; each presser (9) comprising a portion (9a) which is movable independently of the blade (10) towards and away from the box (1) to press a portion of the stay tape against the respective edge (5) whilst the blade (10) is at a position of non-interference relative to the stay tape.

Abstract: There is provided a sheet paper material, at least one face of which is provided with a coating; the coating is a substantially even layer of a composition containing a mixture of polyurethane-base polymer material and kaolin; the coating has the look and feel of plastic, and permits high-quality printing; and the paper material is particularly suitable for packing prestige products.

Abstract: There is provided a sheet paper material, at least one face of which is provided with a coating; the coating is a substantially even layer of a composition containing a mixture of polyurethane-base polymer material and kaolin; the coating has the look and feel of plastic, and permits high-quality printing; and the paper material is particularly suitable for packing prestige products.